# Replace two consecutive equal values with one greater

You are given an array of size ‘n’. You have to replace every pair of consecutive values ‘x’ by a single value ‘x+1’ every time until there is no such repetition left and then print the new array.

Input : 5, 2, 1, 1, 2, 2
Output : 5 4
Explanation:
step 1: While traversing, encountered pair of 1(gets replaced by 2. We get 5, 2, 2, 2, 2
step 2: The first encountered pair of 2 gets replaced by 3. We get 5, 3, 2, 2
step 3: Again pair of 2 gets replaced by 3. We get 5, 3, 3
step 4: Recently formed pair of 3 gets replaced by 4. We get 5, 4
This is our required answer.

Input : 4, 5, 11, 2, 5, 7, 2
Output : 4 5 11 2 5 7 2

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

Approach : In this problem you have to traverse the array of integers and check if any two consecutive integers are of a same value X. Then you have to replace that pair of integers with a single integer X+1. After that you have to begin with a new step by re-traversing the array and performing the same operation.

## C++

 `// C++ program to replace two elements with equal ` `// values with one greater. ` `#include ` `using` `namespace` `std; ` ` `  `// Function to replace consecutive equal  ` `// elements ` `void` `replace_elements(``int` `arr[], ``int` `n) ` `{ ` `    ``int` `pos = 0;  ``// Index in result ` ` `  `    ``for` `(``int` `i = 0; i < n; i++) { ` `        ``arr[pos++] = arr[i]; ` ` `  `        ``while` `(pos > 1 && arr[pos - 2] ==  ` `                          ``arr[pos - 1]) { ` `            ``pos--; ` `            ``arr[pos - 1]++; ` `        ``} ` `    ``} ` ` `  `    ``// to print new array ` `    ``for` `(``int` `i = 0; i < pos; i++) ` `        ``cout << arr[i] << ``" "``; ` `} ` ` `  `// Driver Code ` `int` `main() ` `{ ` `    ``int` `arr[] = { 6, 4, 3, 4, 3, 3, 5 }; ` `    ``int` `n = ``sizeof``(arr) / ``sizeof``(``int``); ` `    ``replace_elements(arr, n); ` `    ``return` `0; ` `} `

## Java

 `// java program to replace two elements ` `// with equal values with one greater. ` `public` `class` `GFG { ` `     `  `    ``// Function to replace consecutive equal  ` `    ``// elements ` `    ``static` `void` `replace_elements(``int` `arr[], ``int` `n) ` `    ``{ ` `        ``int` `pos = ``0``; ``// Index in result ` `     `  `        ``for` `(``int` `i = ``0``; i < n; i++) { ` `            ``arr[pos++] = arr[i]; ` `     `  `            ``while` `(pos > ``1` `&& arr[pos - ``2``] ==  ` `                                  ``arr[pos - ``1``]) ` `            ``{ ` `                ``pos--; ` `                ``arr[pos - ``1``]++; ` `            ``} ` `        ``} ` `     `  `        ``// to print new array ` `        ``for` `(``int` `i = ``0``; i < pos; i++) ` `            ``System.out.print( arr[i] + ``" "``); ` `    ``} ` `     `  `    ``// Driver code ` `    ``public` `static` `void` `main(String args[]) ` `    ``{ ` `        ``int` `arr[] = { ``6``, ``4``, ``3``, ``4``, ``3``, ``3``, ``5` `}; ` `        ``int` `n = arr.length; ` `        ``replace_elements(arr, n); ` `    ``} ` `} ` ` `  `// This code is contributed by Sam007 `

## Python3

 `# python program to replace two elements ` `# with equal values with one greater. ` `from` `__future__ ``import` `print_function ` ` `  `# Function to replace consecutive equal  ` `# elements ` `def` `replace_elements(arr, n): ` ` `  `    ``pos ``=` `0` `# Index in result ` ` `  `    ``for` `i ``in` `range``(``0``, n): ` `        ``arr[pos] ``=` `arr[i] ` `        ``pos ``=` `pos ``+` `1` `        ``while` `(pos > ``1` `and` `arr[pos ``-` `2``] ` `                        ``=``=` `arr[pos ``-` `1``]): ` `            ``pos ``-``=` `1` `            ``arr[pos ``-` `1``] ``+``=` `1` `         `  `    ``# to print new array ` `    ``for` `i ``in` `range``(``0``, pos): ` `        ``print``(arr[i], end``=``" "``) ` ` `  `# Driver Code ` `arr ``=` `[ ``6``, ``4``, ``3``, ``4``, ``3``, ``3``, ``5` `] ` `n ``=` `len``(arr) ` `replace_elements(arr, n) ` `     `  `# This code is contributed by Sam007 `

## C#

 `// C# program to replace two elements ` `// with equal values with one greater. ` `using` `System; ` ` `  `class` `GFG { ` `     `  `    ``// Function to replace consecutive equal  ` `    ``// elements ` `    ``static` `void` `replace_elements(``int` `[]arr, ``int` `n) ` `    ``{ ` `        ``int` `pos = 0; ``// Index in result ` `      `  `        ``for` `(``int` `i = 0; i < n; i++) { ` `            ``arr[pos++] = arr[i]; ` `      `  `            ``while` `(pos > 1 && arr[pos - 2] ==  ` `                                  ``arr[pos - 1]) ` `            ``{ ` `                ``pos--; ` `                ``arr[pos - 1]++; ` `            ``} ` `        ``} ` `      `  `        ``// to print new array ` `        ``for` `(``int` `i = 0; i < pos; i++) ` `            ``Console.Write( arr[i] + ``" "``); ` `    ``} ` ` `  `    ``// Driver code ` `    ``static` `void` `Main() ` `    ``{ ` `        ``int` `[]arr = { 6, 4, 3, 4, 3, 3, 5 }; ` `        ``int` `n = arr.Length; ` `        ``replace_elements(arr, n); ` `    ``} ` `} ` ` `  `// This code is contributed by Sam007 `

## PHP

 ` 1 && ``\$arr``[``\$pos` `- 2] ==  ` `                        ``\$arr``[``\$pos` `- 1]) ` `        ``{ ` `            ``\$pos``--; ` `            ``\$arr``[``\$pos` `- 1]++; ` `        ``} ` `    ``} ` ` `  `    ``// to print new array ` `    ``for` `(``\$i` `= 0; ``\$i` `< ``\$pos``; ``\$i``++) ` `        ``echo` `\$arr``[``\$i``] . ``" "``; ` `} ` ` `  `    ``// Driver Code ` `    ``\$arr` `= ``array``(6, 4, 3, 4, 3, 3, 5); ` `    ``\$n` `= ``count``(``\$arr``); ` `    ``replace_elements(``\$arr``, ``\$n``); ` ` `  `// This code is contributed by Sam007. ` `?> `

Output:

```6 4 3 6
```

My Personal Notes arrow_drop_up Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.

Improved By : Sam007

Article Tags :
Practice Tags :

Be the First to upvote.

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.